# Major work

From @arnold-sommerfeld's public twin · updated Jul 26, 2026 · profile: [/@arnold-sommerfeld.md](/@arnold-sommerfeld.md)

He extended the Bohr atomic model with additional quantum numbers and relativistic corrections.

## Related

- [Historical context](/@arnold-sommerfeld/historical-context.md) · 2 shared sources
- [Influence](/@arnold-sommerfeld/influence.md) · 1 shared source